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React Web Apps Your Team Can Keep Building

We build React frontends for SaaS products, portals and dashboards with TypeScript, tested components and clean API layers that stay easy to extend.

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ComponentsSample
  1. <App />
  2. <OrderTable />query="deliv"
  3. <SearchInput />value="deliv"
  4. <OrderRow />x3
localhost:5173Preview
deliv
  • Neha S.#1040
  • Rohit T.#1039
  • Meera J.#1038

React development for interactive, data-heavy web products

React is the most widely used JavaScript library for building user interfaces. Its component model lets teams break a complex screen into small, testable pieces, and its ecosystem covers routing, forms, charts, tables and state management. That makes it a natural fit for SaaS dashboards, customer portals, admin panels, booking tools and any product where users spend real time interacting with data.

React defines the components, and the framework around it decides where they render, so that choice matters. For logged-in apps and internal tools, a Vite-based single page app is often enough. For marketing pages and content that must rank in search, Next.js adds server rendering and React Server Components, which keep data-heavy parts of the page on the server. Angular can suit large enterprise teams that want a stricter, all-in-one framework, and Vue suits smaller teams that value a gentler learning curve.

Nexzem writes React in TypeScript with a shared component library, typed API clients and automated tests on critical flows. We document patterns as we go, so your in-house developers or a future team can keep shipping without reverse engineering the codebase first. You own 100% of the code from the first commit onward.

Props in, interface out

Type, sort and toggle density. The component re-renders from its props alone, and the JSX updates to match.

What we build with React

React web apps, dashboards and SaaS frontends built in TypeScript with reusable component systems.

  1. 01

    SaaS Product Frontends

    Multi-tenant React applications with role-based access, billing screens, onboarding flows and settings pages, connected to your REST or GraphQL backend.

  2. 02

    Dashboards and Admin Panels

    Data tables, filters, charts and bulk actions built for operations teams who need to search, edit and export large volumes of records quickly.

  3. 03

    Component Libraries

    Reusable, documented UI kits in Storybook with design tokens matched to your Figma files, so every new screen stays visually consistent.

  4. 04

    Legacy Frontend Migration

    Gradual moves from jQuery, AngularJS or class-based React to modern hooks and TypeScript, shipping screen by screen without a risky big-bang rewrite.

  5. 05

    Real-Time Interfaces

    Live chat, notifications, order tracking and collaborative editing using WebSockets or server-sent events, with optimistic updates that keep the interface responsive.

  6. 06

    Performance Optimisation

    Bundle analysis, code splitting, automatic memoisation with the React Compiler and list virtualisation that cut load times and stop slow re-renders on data-heavy screens.

  7. 07

    Accessibility Fixes

    Keyboard navigation, screen reader labels, focus management and colour contrast corrected against WCAG guidelines across your existing React screens.

Why teams pick Nexzem for React

The checks every engagement has to pass before we call it done.

.github/PULL_REQUEST_TEMPLATE.md5/5 checked

  • - [x] Code your team can read

    TypeScript, consistent folder structure and documented components keep onboarding short for new developers.

  • - [x] Faster feature delivery

    A shared component library means new screens are assembled from tested parts rather than built from scratch.

  • - [x] Right framework around React

    We choose between Vite, Next.js and React Native based on SEO, hosting and mobile needs, not habit.

  • - [x] Tested critical paths

    Login, checkout and data-entry flows get automated tests so regressions are caught before release.

  • - [x] Flexible engagement

    Fixed scope for defined projects or a dedicated React team billed monthly when your roadmap keeps moving.

Choosing a React framework and rendering strategy

React itself handles components and rendering, so every project also needs decisions about routing, data loading and where pages render. The React team now recommends starting with a framework for most new apps. Next.js offers server components, server rendering and static generation, and React Router provides a capable framework mode that grew out of Remix. A plain single-page app built with Vite still suits internal tools behind a login.

The deciding factors are SEO, first-load speed and hosting. Public, search-facing pages benefit from server rendering or static generation, while dashboards and admin panels gain little from it. Our Next.js vs React comparison explains when a framework is worth its added concepts, and our React vs Angular and React vs Vue comparisons cover the wider framework choice.

Hosting and team skills shape the choice too. Frameworks with server rendering need a Node.js-capable host or a platform such as Vercel, Netlify or a container service, while static and single-page apps deploy to any CDN. Pick the simplest option that meets SEO and performance needs, since extra rendering modes add operational work.

How we structure a React codebase

We use TypeScript throughout and organize code by feature, keeping components, hooks, API calls and tests for each feature together. Server data is fetched and cached with TanStack Query, forms use React Hook Form with Zod schemas shared with the backend where possible, and global client state is kept minimal. Accessible primitives such as Radix UI form the base of the component library.

Components are documented in Storybook, which doubles as a review tool for designers. Unit and component tests run with Vitest and Testing Library, end-to-end tests with Playwright, and automated accessibility checks catch missing labels and contrast problems. Linting, formatting and type checks run on every pull request.

  • Feature folders instead of global components and utils dumps.
  • API types generated from OpenAPI or GraphQL schemas.
  • Design tokens shared between Figma and code.
  • Error boundaries and loading states for every data-driven view.
  • Bundle size budgets checked in CI.

Common React pitfalls

Many React performance and bug reports trace back to a few habits: storing derived data in state and syncing it with effects, putting fast-changing values in context so large trees re-render, fetching data in effects without caching or cancellation, and shipping large libraries for small features. Clear data flow and a proper server-state library prevent most of them.

The React Compiler can now handle much memoization automatically, but it does not fix unclear state design. Missing error boundaries, inaccessible custom widgets built from div elements and inconsistent loading states are other frequent problems that reviews and automated checks should catch before release.

  • Derive values during render instead of syncing state with effects.
  • Keep fast-changing state close to where it is used.
  • Fetch server data through a caching library.
  • Wrap risky sections in error boundaries.
  • Use real buttons, links and inputs for accessibility.

How React projects run

$ git log --graph --oneline main..delivery

  1. bec031f

    feat: frontend audit or discovery

    We review designs, APIs and any existing code, then agree architecture, state management and testing approach.

  2. 32b7adc

    feat: component foundation

    Design tokens, base components and layout primitives are set up first so later screens move quickly.

  3. 28c869e

    feat: feature sprints

    Screens and flows built in two-week sprints with preview deployments you can click through.

  4. f68f66f

    feat: test and optimise

    Automated tests, accessibility checks and performance budgets reviewed before each release.

  5. 8ebe78a

    merge: release and handover

    CI deployment, documentation and optional ongoing support or a dedicated team.

What teams build with React

  • Operations dashboard for a logistics company

    Dispatchers monitor shipments, exceptions and driver status on a React dashboard with live updates, filters and maps, replacing several spreadsheets and making it obvious which deliveries need attention right now.

  • Design system for several products

    A company with multiple web products builds a shared React component library with tokens, accessibility built in and Storybook documentation, so every team ships consistent interfaces and fixes improve all products at once.

  • Migrating a jQuery app to React

    A legacy jQuery admin panel is migrated screen by screen to React, running side by side during the transition, so users see steady improvements without a risky big-bang rewrite or a long feature freeze.

  • Real-time trading interface

    A brokerage builds a React trading screen with streaming prices, order books and charts updated many times per second, using virtualized lists and careful rendering so the interface stays responsive during volatile markets.

  • Embeddable widget for partner sites

    A SaaS company ships a React-based widget, such as a booking or quote form, that partners embed on their websites with one script tag, isolated from the host page's styles and tracked for conversions.

Where React sits in your stack

The tools we pair it with, layer by layer. Select a layer to see what it is responsible for.

Technologies often used with React

All 32 technologies

More in Frontend

React development FAQs

Something else on your mind? Ask a consultant and get a reply within one business day.

When should we use React instead of Angular or Vue?

React suits products that need a large hiring pool, a flexible ecosystem and a path to mobile through React Native. Angular suits large enterprise teams that prefer a single opinionated framework. Vue suits smaller teams that want simplicity. We recommend based on your team and product.

What does a React project cost?

Cost depends on the number of screens, complexity of data tables and forms, real-time features, design work and backend integration. After a free consultation we send a fixed quote, or a monthly rate if you prefer a dedicated team.

Can you work with our existing backend team?

Yes. We agree API contracts early, generate typed clients where possible, and join your stand-ups or communication channels so frontend and backend stay in step.

Do React apps work for SEO?

Client-only React apps are weaker for search. For public pages we recommend Next.js server rendering or static generation, while logged-in areas can stay as a standard React app.

How do you keep our code and data secure?

We work in private repositories, follow least-privilege access, avoid storing tokens in unsafe places, sanitise user content and sign an NDA on request. You own all code and IP.

Should we use a component library or build our own?

Most teams should start from an accessible foundation such as Radix UI, shadcn/ui or MUI and customize it to their brand. Building every component from scratch is slow and often misses accessibility details. A custom design system makes sense once several products need consistent, branded components.

Can React be added to part of an existing website?

Yes. React can mount into specific sections of an existing page, such as a configurator, search or checkout, while the rest of the site stays as it is. This is a common way to modernize gradually without rebuilding the whole website at once.

We work with clients across the USA, UK, Australia, UAE, New Zealand and India.

Where we work

Tell us what you're building.

A solutions consultant replies within one business day with a recommended stack, a rough estimate and a suggested team.

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